<template>
  <div>
    <!--面包屑导航区-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图区域-->
    <el-card>
      <!--警告区域-->
      <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning"
                :closable="false" show-icon>
      </el-alert>

      <!--选择商品分类区域-->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类</span>
          <!--选择商品分类级联选择框-->
          <el-cascader v-model="selectedCateKeys" :options="cateList"
                       :props="cateProps" @change="handleChange">
          </el-cascader>
        </el-col>
      </el-row>

      <!--Tabs标签页-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!--添加动态参数的面板-->
        <el-tab-pane label="动态参数" name="many">
          <!--添加参数的按钮-->
          <el-button type="primary" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
          <!--动态参数表格-->
          <el-table :data="manyTable" border stripe>
            <!--展开行-->
            <el-table-column type="expand" align="center">
              <template slot-scope="scope">
                <!--循环渲染Tag标签-->
                <el-tag v-for="(item,index) in scope.row.attr_vals"
                        :key="index" closable @close="handleClose(index,scope.row)">
                  {{ item }}
                </el-tag>
                <!--输入的文本框-->
                <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!--添加按钮-->
                <el-button v-else class="button-new-tag" size="small"
                           @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <!--索引列-->
            <el-table-column type="index" label="序号" align="center" width="50"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name" align="center"></el-table-column>
            <el-table-column label="操作" align="center">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">
                  编辑
                </el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>

        <!--添加静态属性的面板-->
        <el-tab-pane label="静态属性" name="only">
          <!--添加属性的按钮-->
          <el-button type="primary" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
          <!--静态属性表格-->
          <el-table :data="onlyTable" border stripe>
            <!--展开行-->
            <el-table-column type="expand" align="center">
              <template slot-scope="scope">
                <!--循环渲染Tag标签-->
                <el-tag v-for="(item,index) in scope.row.attr_vals"
                        :key="index" closable @close="handleClose(index,scope.row)">
                  {{ item }}
                </el-tag>
                <!--输入的文本框-->
                <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!--添加按钮-->
                <el-button v-else class="button-new-tag" size="small"
                           @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <!--索引列-->
            <el-table-column type="index" label="序号" align="center" width="50"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name" align="center"></el-table-column>
            <el-table-column label="操作" align="center">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">
                  编辑
                </el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!--添加参数对话框-->
    <el-dialog
        :title="'添加' + titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed">
      <!--添加表单验证-->
      <el-form :model="addForm" :rules="addFormRules" ref="addFromRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
    </el-dialog>

    <!--修改参数对话框-->
    <el-dialog
        :title="'修改' + titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed">
      <!--添加表单验证-->
      <el-form :model="editForm" :rules="editFormRules" ref="editFromRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Params",
  data() {
    return {
      //商品分类列表
      cateList: [],
      //级联选择器的配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
      },
      //级联选择器双向绑定到的数组
      selectedCateKeys: [],
      //被激活的Tabs标签页
      activeName: 'many',
      //动态参数的数据
      manyTable: [],
      //静态属性的数据
      onlyTable: [],
      //控制添加对话框的显示与隐藏
      addDialogVisible: false,
      //添加参数的表单数据对象
      addForm: {},
      //添加表单验证规则对象
      addFormRules: {
        attr_name: [{required: true, message: '请输入参数名称', trigger: 'blur'},]
      },
      //控制修改对话框的显示与隐藏
      editDialogVisible: false,
      //修改的表单数据对象
      editForm: {},
      //修改表单验证规则对象
      editFormRules: {
        attr_name: [{required: true, message: '请输入参数名称', trigger: 'blur'},]
      },
    }
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取所有的商品分类列表
    async getCateList() {
      const {data: res} = await this.$axios.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败!')
      }
      this.cateList = res.data;
      // console.log(this.cateList)
    },
    //级联选择器选项发生变化时，会触发这个函数
    handleChange() {
      // console.log(this.selectedCateKeys)
      this.getParamsData();
    },
    //Tabs 标签页点击的处理函数
    handleTabClick() {
      // console.log(this.activeName);
      this.getParamsData();
    },
    //获取参数列表数据
    async getParamsData() {
      // 证明选择的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTable = []
        this.onlyTable = []
        return
      }
      //证明选择的是三级分类
      // console.log(this.selectedCateKeys)
      //根据所选分类的Id, 和当前所处的面板， 获取对用的参数
      const {data: res} = await this.$axios.get(`categories/${this.cateId}/attributes`, {
        params: {sel: this.activeName}
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败!')
      }

      // console.log(res.data);
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        //控制文本框的显示与隐藏
        item.inputVisible = false
        //文本框中输入的值
        item.inputValue = ''
      })
      // console.log(res.data);

      if (this.activeName === 'many') {
        this.manyTable = res.data
      } else {
        this.onlyTable = res.data
      }
    },
    //监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFromRef.resetFields();
    },
    //点击按钮，添加参数
    addParams() {
      this.$refs.addFromRef.validate(async valid => {
        if (!valid) return
        const {data: res} = await this.$axios.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName,
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败!')
        }
        this.$message.success('添加参数成功!')
        this.addDialogVisible = false
        this.getParamsData();
      })
    },
    //点击按钮，展示修改的对话框
    async showEditDialog(attr_id) {
      //查询当前参数的信息
      const {data: res} = await this.$axios.get(`categories/${this.cateId}/attributes/${attr_id}`, {
        params: {attr_sel: this.activeName}
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败!')
      }
      this.editForm = res.data;
      this.editDialogVisible = true
    },
    //重置修改的表单
    editDialogClosed() {
      this.$refs.editFromRef.resetFields();
    },
    //点击按钮，修改参数
    editParams() {
      this.$refs.editFromRef.validate(async valid => {
        if (!valid) return
        const {data: res} = await this.$axios.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败!')
        }
        this.$message.success('修改参数成功!')
        this.getParamsData();
        this.editDialogVisible = false
      })

    },
    //根据Id删除对应的参数项
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      //用户取消了删除的操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除!')
      }
      //删除的业务逻辑
      const {data: res} = await this.$axios.delete(`categories/${this.cateId}/attributes/${attr_id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败!')
      }
      this.$message.success('删除参数成功!')
      this.getParamsData();
    },
    //文本框失去焦点，或按下enter触发的事件
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      //如果没有return,则证明输入了内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row);
    },
    //删除对应的参数可选项
    handleClose(index, row) {
      row.attr_vals.splice(index, 1);
      this.saveAttrVals(row);
    },
    //将对 attr_vals 的操作保存到数据库
    async saveAttrVals(row) {
      //需要发起请求，保存数据
      const {data: res} = await this.$axios.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' '),
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败!')
      }
      this.$message.success('修改参数项成功!')
    },
    //点击按钮.展示文本框
    showInput(row) {
      row.inputVisible = true
      //让文本框获得焦点
      //$nextTick方法的作用，就是当页面上的元素被重新渲染后，才会执行回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    }
  },
  computed: {
    //如果按钮需要被禁用，则返回true, 否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    //当前选中的三级分类的Id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    //动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  },
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}

.el-cascader {
  margin: 0 10px;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 120px;
}
</style>